I start by stirring together the kosher salt, dried thyme, paprika, garlic powder and black pepper in a small bowl. This simple mix is doing all the heavy lifting here, so make sure it's well combined before it touches the turkey.
I pat the turkey completely dry with paper towels, inside and out, and remove the giblets from the cavity. A dry surface helps the salt rub stick properly and also helps the skin crisp up later in the oven.
I sprinkle a little rub inside the cavity first, then flip the turkey over to season the underside, and finally rub the rest generously over the breast and legs, working a bit under the skin if I can. Don't be shy with the breast — it needs the most help staying juicy.
Next, I wrap the turkey tightly in cling wrap, almost like a mummy, so the salt stays pressed against the skin. It goes into the fridge, breast-side down, for 48 hours, and I flip it over halfway through that time.
About 30 minutes before roasting, I unwrap the turkey and pat off any extra moisture. The skin should look slightly tacky, not wet. I leave it out briefly so it isn't ice-cold going into the oven.
I lay the onion and garlic halves in the roasting pan and set a rack on top. Inside the turkey cavity, I stuff a bundle of fresh herbs, a couple of garlic halves and a few tablespoons of butter for extra flavour as it roasts.
I place the turkey breast-side down on the rack, brush it with melted butter, and roast it at a high temperature for 30 minutes. Starting upside down lets the juices settle into the breast meat, which is usually the driest part.
Using clean kitchen towels, I carefully flip the turkey breast-side up, brush it again with butter, and drop the oven temperature. This is where the bird really starts turning that gorgeous golden colour.
Partway through roasting, I mix the remaining butter with minced garlic and chopped herbs, then brush it generously over the skin. Adding it now, rather than earlier, stops the garlic from burning.
Once the thickest part of the thigh reads 165°F / 75°C on a meat thermometer, I pull the turkey out, loosely tent it with foil, and let it rest for a full 30 minutes before carving. This resting step is non-negotiable for juicy meat.